Interdiffusion Coefficients and Strengthening Effects of Nb, Ta, and Zr in the α2-Ti3Al Phase

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2024-04-16 DOI:10.1007/s11669-024-01105-y

L. Haußmann, J. Bresler, S. Neumeier, F. Pyczak, M. Göken

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Abstract

The creep properties of fully lamellar γ/α₂ titanium aluminides can be significantly improved by alloying with Nb, Ta or Zr. While the influence of these alloying elements on the γ-phase has already been examined, their diffusivity and strengthening properties in the α₂-phase are still lacking. In order to study the effect of Nb, Ta and Zr in α₂-Ti₃Al, the alloys Ti-33Al, Ti-33Al-5Nb, Ti-33Al-5Ta and Ti-33Al-5Zr were investigated using a diffusion couple approach and strain rate jump tests. The results show that Zr diffuses the fastest, followed by Nb and Ta. Furthermore, these alloying elements also increase the strength compared to a binary Ti-33Al alloy, from which Zr leads to the highest strength increase followed by Ta and Nb. The lower diffusivity of Ta becomes increasingly important at higher temperatures and lower strain rates resulting in a higher strengthening potential than Nb and Zr under such conditions.

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α2-Ti3Al相中Nb、Ta和Zr的相互扩散系数和强化效应

通过与 Nb、Ta 或 Zr 进行合金化，可显著改善全片状 γ/α2 钛铝化物的蠕变特性。虽然已经研究了这些合金元素对 γ 相的影响，但仍缺乏它们在 α2- 相中的扩散性和强化性能。为了研究 Nb、Ta 和 Zr 在 α2-Ti3Al 中的影响，使用扩散耦合方法和应变速率跃迁试验研究了合金 Ti-33Al、Ti-33Al-5Nb、Ti-33Al-5Ta 和 Ti-33Al-5Zr。结果表明，Zr 的扩散速度最快，其次是 Nb 和 Ta。此外，与二元 Ti-33Al 合金相比，这些合金元素还能提高强度，其中 Zr 的强度提高幅度最大，其次是 Ta 和 Nb。在较高温度和较低应变率条件下，Ta 的较低扩散率变得越来越重要，因此在这种条件下，其强化潜力高于 Nb 和 Zr。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.